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by SHIPCHIEF
Sat Jun 09, 2018 9:27 pm
Forum: Russian Monoplanes
Topic: IAC competition in YAK-55
Replies: 2
Views: 1885

Re: IAC competition in YAK-55

Thank you Neville. This week end I attended Akro amp @ Ephrata WA, I think it was put on by the Canadian IAC closest chapter. There were 4 unlimited World Competitors on the ground, giving radio instruction in rotation. Each attendee received three 15 minute lessons per day over 3 days. I still don'...
by SHIPCHIEF
Mon Mar 19, 2018 1:45 pm
Forum: Russian Monoplanes
Topic: Whirlwind Propeller blades
Replies: 12
Views: 3519

Re: Whirlwind Propeller blades

Yesterday I spent most of the day with the Yak & Dyna Vibe. I eventually ended up frustrated. The frame I made to hold the synchronizing light and the vibration transducer may be vibrating from propeller beat airflow or something... I tried several combinations of weights and locations, and chained ...
by SHIPCHIEF
Sat Mar 17, 2018 10:11 pm
Forum: Russian Monoplanes
Topic: Whirlwind Propeller blades
Replies: 12
Views: 3519

Re: Whirlwind Propeller blades

Today I put the DynaVibe prop balancer on the Yak, the first time with the new blades. I flew the Yak yesterday, and the vibrations were pretty bad, similar to the original paddle prop, feeling like a washing machine on spin cycle with all my blue jeans on one side.. Although the tip vortex vibratio...
by SHIPCHIEF
Sun Nov 26, 2017 9:02 pm
Forum: Laser
Topic: Whirlwind propeller shake
Replies: 15
Views: 6411

Re: Whirlwind propeller shake

Put the weight back on. You had it right for one moment there. Go back. It's not a crime to put it back, them fly and change the weight or move it a bit. Would be better if you could fly with the Aces Machine. Dynamic balancing on the ground misses the mark in a whole lot of ways. First, you will ne...
by SHIPCHIEF
Sun Nov 26, 2017 12:31 am
Forum: Russian Monoplanes
Topic: Whirlwind Propeller blades
Replies: 12
Views: 3519

Re: Whirlwind Propeller blades

The plywood pitch fixture fits over the front of the downward sweeping blade. You slide it in from the tip until it snugs over the leading and trailing edges. It will need to be set vertical. It will rock and needs to be stabilized. Holding it in place with the digital level is quite a hand full. I ...
by SHIPCHIEF
Sun Nov 26, 2017 12:19 am
Forum: Russian Monoplanes
Topic: Whirlwind Propeller blades
Replies: 12
Views: 3519

Re: Whirlwind Propeller blades

After unclamping the counterweight pinch bolts, the old propeller blades simply screw out. Inspect & clean the socket and lightly grease the threads. The new blades screw in until they bottom out, then back them out to the desired pitch. Use the pitch paddle and pitch gauge fixture with protractor (...
by SHIPCHIEF
Sun Nov 26, 2017 12:09 am
Forum: Russian Monoplanes
Topic: Whirlwind Propeller blades
Replies: 12
Views: 3519

Re: Whirlwind Propeller blades

To set blade pitch when the propeller shaft is inclined, the angle must be known. These blades specify 17 degrees of pitch at the low pitch stop. 83.2-17=66.2 on the down sweeping blade
IMG_20171125_100415.jpg
IMG_20171125_100415.jpg (1.6 MiB) Viewed 2216 times
by SHIPCHIEF
Sun Nov 26, 2017 12:05 am
Forum: Russian Monoplanes
Topic: Whirlwind Propeller blades
Replies: 12
Views: 3519

Re: Whirlwind Propeller blades

This pinch bolt locks the counterweight and pitch sleeve together with the blade root, after the pitch is set.
IMG_20171125_100337.jpg
IMG_20171125_100337.jpg (1.3 MiB) Viewed 2217 times
by SHIPCHIEF
Sun Nov 26, 2017 12:02 am
Forum: Russian Monoplanes
Topic: Whirlwind Propeller blades
Replies: 12
Views: 3519

Re: Whirlwind Propeller blades

The piston seal and cylinder wall must be clean, without defects. Notice the sludge buildup, deposited by centrifugal force. Clean this out with a soft paper shop towel, leave no lint.
IMG_20171125_100248.jpg
IMG_20171125_100248.jpg (1.88 MiB) Viewed 2218 times
by SHIPCHIEF
Sat Nov 25, 2017 8:48 pm
Forum: Russian Monoplanes
Topic: Whirlwind Propeller blades
Replies: 12
Views: 3519

Re: Whirlwind Propeller blades

Remove the piston and cylinder over a bucket, oil will spill out.
IMG_20171125_100152.jpg
IMG_20171125_100152.jpg (1.32 MiB) Viewed 2230 times